HR Diagrams Quiz

Who was Williamina Fleming?

• astronomer at Harvard in 1881; tried to classify stars based on amount of hydrogen with classes A through Q to try and understand why they have different temperatures and luminosities

• astronomer at Harvard; changed classification system of stars and reduced classes to O, B, A, F, G, K, and M

• astronomers in 1919; plotted stars on a graph based on luminosity and temperature

Who was Annie Jump Cannon?

• astronomer at Harvard in 1881; tried to classify stars based on amount of hydrogen with classes A through Q to try and understand why they have different temperatures and luminosities

• astronomer at Harvard; changed classification system of stars and reduced classes to O, B, A, F, G, K, and M

• astronomers in 1919; plotted stars on a graph based on luminosity and temperature

Who was Ejnar Hertzsprung and Henry Norris Russel?

• astronomer at Harvard in 1881; tried to classify stars based on amount of hydrogen with classes A through Q to try and understand why they have different temperatures and luminosities

• astronomer at Harvard; changed classification system of stars and reduced classes to O, B, A, F, G, K, and M

• astronomers in 1919; plotted stars on a graph based on luminosity and temperature

What class of stars is the coolest?

• O

• B

• A

• F

• M

What class of star is our sun?

• O

• B

• A

• G

• M

What class of stars is the hottest?

• O

• B

• A

• F

• M

What axis is luminosity on in an HR diagram?

• x-axis

• y-axis

What axis is temperature on in an HR diagram?

• x-axis

• y-axis

The farther right on an HR diagram, the _____ the star is.

• hotter

• cooler

• brighter

• dimmer

Red giants and supergiants have...

• run out of hydrogen and are dying, fusing other elements

• died, not fusing any elements

• enough hydrogen to maintain fusion, still fusing hydrogen into helium

Tags

NGSS.HS-ESS1-3

NGSS.HS-PS1-8